Plaster board



Jan. 24, 1928. 1,657,333

C. ABSMEIER PLASTER BOARD Original Filed Nrhv. 25, 1925 Patented Jan. .24, 1928.

UNITED STATES cam. Ansnnrnn, or nAYWooD, ILLINOIS.

- lFlEISSUED IPLASTEB BOARD.

1,657,333 PATENT oFFlcE.

Application led November 23, 1925, VSerial No. 70,765. BenewedNovember 10, 1927.

This invention relates to plaster board and is more particularly concernedwith a novel construction of covering Aforl the body of the board and a novel interlocking means s of joining the covering sheets of fibrous material which are used to cover the plaster body at the edges of said board. In the making of plaster board it is common practice to make a body of cementitious material, usually a plaster of Paris com osition, which is covered on opposite siffes with fibrous material, usually1 paper. The edges of t e board are sometimes left uncovered and inV other cases are l5 covered in various manners. My invention is directed particularly to a new edge covering for plaster board which comprises interlocking tongues on opposite pieces of paper covering for the opposite sides of the plaster board which are turned inwardly toward each other and are 'bent under the adjacent inwardly turned or edge portions of the paper covering making a secure and interlocking connectionof the opposite covering sheets for the plaster board at the edges thereof.

Constructions which embody my invention are fully shown in the accompanying drawing, in which', Y Fig. 1 is a fragmentary perspective view showing opposed covering sheets for the body of plaster, the same being separated.

Fig. 2 is a fragmentary perspective view of an edge of the plaster board which has been covered. Fig. 3 is a fragmentary transverse section through the 'construction shown in Fig. 2. y l

ig. 4 is a viewsimilar to Flg. 1 illustrat- 40A ing al somewhat dilerent form of the 1nvention.

,Fig 5 is a transverse section similar to Fig. 3 of plaster board made with the coverings shown in Fig. 4. I

Fig. 6 is a perspective view similar to Fig. y1 illustrating a slight modification of the construction shown in Fig. l, and'k Fig. 7 is a section similar to that shown in Fig. 3 showing the plaster board equipped Iwith the coverings illustrated inFig. 6.

Like reference characters refer to like parts in the different figures of the drawing. The body 1 of cementitious material may be of any desired width and length and it is relatively thin. On opposite sides of this body coverings of fibrous material, prefera certainA type of ably certain grades of paper, are placed. The upper coveringsheet 2 at its side edges is bent inwardly at right angles to make the.

.upwardl at right angles Ato make the section 7 w 'ch, at its edge, is also cut to form alternate upwardly projecting tongues 8 and recesses 9 etween the tongues. The position ofthe tongues and recesses on the two opposed edge sections Sand 7 of the coverings is such that the tongues 4 are directly opposite the recesses 9 and, similarly, the

tongues 8 are directly opposite the re- .cesses 5."

When appliedl to the body 1 of plaster it .the tongues 8 maypass into the recesses 5 and thence be bent inwardly so as to lie within the inner sides of the edge section 3 of the upper covering sheet 2. This is fully shown in Fig. 3 and it is clear, as thus constructed, the tongues 4 and 8 are held in vnterlocked engagement, the plaster body 1 bearing against said tongues, it being understood that in the process of making the plaster board the I covering sheets'2 and 6 with their edge portions 3 and 7 having the tongues 4 and 8 are applied while the'plaster body is still in plastic state and it is rolled or otherwise worked into position that it presses against said tongues, the paper covering cementing to the plaster body as it sets and har-dens.

The edge of the board thus made is shown in Fig. 2 and, if it is desired, a strip of paper 10 may be glued or otherwise cemented to the edge of the board so as to cover the joints which would appear otherwise, This,

however, isnot necessary and my invention isin no sense limited to the addition of the covering strip 10, as shown in Figs. 2 and 3.

In Figs. 4 and 5 another form ofthe invention is shown in which the tongues 4 are of greater length and have their end portions turnedinwardly at right angles, as indicated at 11. The tongues 8 also are of greater length and have their upper end portions turned inwardly at right angles,

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as indicated at 12. When the board is made with coverings of vthis character applied to the body l it will be evident that the tongues 11 and 12 extend inwardly along the inner sides of the lower and upper covering sheets 6 and 2, respectively, as shown in Fig. 5.

In'Figs. 6 and 7 the construction shown is very siinilar to that' shown in Figs. 1 and 3, the only difference being that the tongues 4 and 8 are shorter than the tongues 4 and 8 and the recesses 5a and 9 are correspondingly shallower. The section of the board formed with coveringsot this character is shown in Fig. 7 and it is evident that the tongues 4 and 8a do not extend downwardly and upwardly as far as the tongues 4 and 8 in the construction shown in Fig. 3, but that an interlocking of the opposed covering sheets of paper at the edges oi' the board is made and a complete covering ot' the board edges is effected.

This construction of plaster board is simple and effective and is very easily produced without any involved process of manufac- The invention is defined in the appended claims and is to be considered as comprehensive of all 4forms of structure coming within their scope,

I claim:

1. Plaster board of the character described comprising a flat body and a covering sheet on each face ot' the body, said sheets at-an edge of the body being folded toward each other and against said edge of the body, the

edges of said sheets being formed with a1- ternate tongues and recesses between said tongues, the tongues on the sheets entering the recesses on the' opposite sheets and being bent inwardly and extending beyond the bottoms of said recesses at the inner sides of the edge portions of said covering sheets.

2. Plaster board ot' the character described comprising a iat' body and a covering sheet of material on each face of the body, said sheets at the opposite edges of the body being folded toward each other and against the edges of the body and each being provided With projecting tongues separated by recesses, said tongues having interlocking engagement with each other and the opposite covering sheets.

3. llaster board ol" the character described comprising a fiat body of cementitious inaterial, and a covering sheet on each face of the body, said sheets at each edge of the body being folded toward each other and each being provided with projecting tongues separated by recesses, the tongues on one sheet passing between tongues on the opposite sheet and lying against the inner sides of the edge portion of said sheets beyond the bottoms of said recesses.

4. Plaster board of the character described comprising'a tlatbody, and a covering sheet on each face of the body, said sheets at an edge of the body being folded toward each other and against said edge of the body, the edges of said sheets being formed with alternate tongues and recesses between said tongues, said tongues on-one sheet passing between the tongues on the opposite sheet and lying against the inner sides of the edge portion of said sheets and at their ends being bent inwardly substantially at right angles so yas to lie above and below the body adjacent the edges of said body.

In testimony whereof I atlix my signature.

C ARL ABSMEIER. 

